Here is a link to a very interested site,very informative.
http://www.scotnet.co.uk/jon/guns/177pellet_tests.html
Here's another link that works out your pellet trajectory. I've used it to calculate MOA (you can do inches or Mils as well) for my EV2 using .177 JSB's and it's accurate to about 1/4 inch out to 100 yards, well maybe 70! The BC for the JSB's is 0.023 by the way. You need to play around with the scope height (1.9 inches using BKL 30mm mounts) but once you get it right you just input your MV and off it goes. I've done charts for cold weather when the MV drops and it just works fine. There's other stuff which works out BC as well.
http://www.eskimo.com/~jbm/ballistics/traj/traj.html
It's web based, so nothing to download.
Have fun
Robert